One day, I had a bad toothache. I couldn't eat anything. So I went to see the dentist.

Doctor: What's your name?

Zhang: Zhang Qiang.

Doctor: What's wrong?

Zhang: I have a toothache.

Doctor: Let me see. Open your mouth, please.

Zhang: Ah…

Doctor: Oh, you have a bad tooth. There is a hole in one of the teeth.

Zhang: Is it serious?

Doctor: Not really. Do you often eat candy and chocolate?

Zhang: Yes, I do. I often eat ice cream, biscuits, chocolates and colas and milk with sugar are my favorite.

Doctor: You shouldn't eat too much candy and chocolate. All these are bad for your teeth. You must eat less sweet and brush your teeth at least twice every day.

Zhang: Ok.

Doctor: Now let me fill your tooth….Take this medicine. Come and see me next week.

Zhang: Thank you! Bye!